Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / include / media / media-device.h

diff --git a/kernel/include/media/media-device.h b/kernel/include/media/media-device.h
new file mode 100644 (file)
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--- /dev/null
+++ b/kernel/include/media/media-device.h
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+/*
+ * Media device
+ *
+ * Copyright (C) 2010 Nokia Corporation
+ *
+ * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+ *          Sakari Ailus <sakari.ailus@iki.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef _MEDIA_DEVICE_H
+#define _MEDIA_DEVICE_H
+
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+
+#include <media/media-devnode.h>
+#include <media/media-entity.h>
+
+struct device;
+
+/**
+ * struct media_device - Media device
+ * @dev:       Parent device
+ * @devnode:   Media device node
+ * @model:     Device model name
+ * @serial:    Device serial number (optional)
+ * @bus_info:  Unique and stable device location identifier
+ * @hw_revision: Hardware device revision
+ * @driver_version: Device driver version
+ * @entity_id: ID of the next entity to be registered
+ * @entities:  List of registered entities
+ * @lock:      Entities list lock
+ * @graph_mutex: Entities graph operation lock
+ * @link_notify: Link state change notification callback
+ *
+ * This structure represents an abstract high-level media device. It allows easy
+ * access to entities and provides basic media device-level support. The
+ * structure can be allocated directly or embedded in a larger structure.
+ *
+ * The parent @dev is a physical device. It must be set before registering the
+ * media device.
+ *
+ * @model is a descriptive model name exported through sysfs. It doesn't have to
+ * be unique.
+ */
+struct media_device {
+       /* dev->driver_data points to this struct. */
+       struct device *dev;
+       struct media_devnode devnode;
+
+       char model[32];
+       char serial[40];
+       char bus_info[32];
+       u32 hw_revision;
+       u32 driver_version;
+
+       u32 entity_id;
+       struct list_head entities;
+
+       /* Protects the entities list */
+       spinlock_t lock;
+       /* Serializes graph operations. */
+       struct mutex graph_mutex;
+
+       int (*link_notify)(struct media_link *link, u32 flags,
+                          unsigned int notification);
+};
+
+/* Supported link_notify @notification values. */
+#define MEDIA_DEV_NOTIFY_PRE_LINK_CH   0
+#define MEDIA_DEV_NOTIFY_POST_LINK_CH  1
+
+/* media_devnode to media_device */
+#define to_media_device(node) container_of(node, struct media_device, devnode)
+
+int __must_check __media_device_register(struct media_device *mdev,
+                                        struct module *owner);
+#define media_device_register(mdev) __media_device_register(mdev, THIS_MODULE)
+void media_device_unregister(struct media_device *mdev);
+
+int __must_check media_device_register_entity(struct media_device *mdev,
+                                             struct media_entity *entity);
+void media_device_unregister_entity(struct media_entity *entity);
+
+/* Iterate over all entities. */
+#define media_device_for_each_entity(entity, mdev)                     \
+       list_for_each_entry(entity, &(mdev)->entities, list)
+
+#endif